Night Light of Gangavalli (Tamil Nadu) from space (India) Src. Average luminocity for 10x10km area is 7.197% and for 50x50km: 6.4501%.
Square area 10x10 km:
 0%
 0%
 0%
 1.52%
 1.3%
 0.65%
 0.87%
 3.46%
 3.46%
 4.33%
 84.42%Square area 50x50 km:
 0%
 0.32%
 0.57%
 0.59%
 0.77%
 1.18%
 2.09%
 1.75%
 2.25%
 5.48%
 85.01%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
12° 11' 11.2" North, 77° 56' 47.5" East
11° 29' 53.8" North, 78° 38' 58.8" East
10° 48' 30.4" North, 79° 21' 10" East
Some cities around Gangavalli sort by population:
• Attur
		11.9 km =7.4 mi, 
333°
• Turaiyūr
		39.2 km =24.4 mi, 
188°
• Perambalur
		38.9 km =24.2 mi, 
139°
• Chinna Salem
		28.7 km =17.8 mi, 
58°
• Arumbāvūr
		15.7 km =9.8 mi, 
146°
• Vīraganūr
		9.7 km =6 mi, 
104°
• Belūr
		34.6 km =21.5 mi, 
312°
• Uppiliyapuram
		30 km =18.6 mi, 
209°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016